Mastercam+x72022+virtual+usb+bus+error+39+fixed | Portable

It looks like you have provided a search query or a title for a technical fix regarding Mastercam X7 2022 and a specific Windows error.

Here is the information and solution based on that query:

Problem: You are trying to run Mastercam X7 (or a similar version) on Windows, but the software fails to launch or cannot find the SIM (license), displaying "Virtual USB Bus Error 39".

Cause: This error is caused by the Mastercam USB Emulator (the "virtual USB" driver used to simulate the hardware license key). Specifically, Error 39 in Windows Device Manager means that the driver installed correctly, but Windows cannot load the specific driver file (usually due to digital signature requirements or a corrupted registry entry).

Summary: The Golden Sequence

For mastercam x72022 virtual usb bus error 39 fixed, follow this sequence exactly:

Disable Signature Enforcement → Uninstall old bus → Clean registry (delete Upper/LowerFilters) → Reboot → Install HASP 8.31+ drivers → Reboot → Run NHASPX diagnostics.

Do not skip the registry step—it is the #1 solution that forums miss. mastercam+x72022+virtual+usb+bus+error+39+fixed

Step 3: The Registry Fix (Directly Targets Error 39)

Error 39 in the Virtual USB Bus is often caused by a corrupted UpperFilters or LowerFilters registry value. Here is the manual fix:

  1. Press Win+R, type regedit, press Enter.

  2. Navigate to:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000

    Note: This GUID corresponds to USB host controllers and virtual root hubs.

  3. On the right pane, locate:

    • UpperFilters
    • LowerFilters

  4. Delete both values (right-click → Delete). Do not delete any other entries. It looks like you have provided a search

  5. Now navigate to:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\vusbbus

    If this key exists, delete the entire vusbbus key.

  6. Close Registry Editor and reboot.

After reboot, Windows will rebuild the USB bus stack. Reinstall the Virtual USB Bus driver from scratch using the Mastercam HASP installer.

The Ghost in the Machine: Mastercam, the Virtual Bus, and Error 39

Method 1: Disable Driver Signature Enforcement (Temporary)

If you just need the software to boot once:

  1. Click Start, hold Shift and click Restart.
  2. Go to Troubleshoot > Advanced Options > Startup Settings > Restart.
  3. Press 7 or F7 to select "Disable driver signature enforcement".
  4. Run Mastercam. (Note: This resets on the next reboot).

Introduction: The Mastercam Licensing Nightmare

For over a decade, Mastercam users relying on NetHASP (Network Hardware Security Key) or Virtual HASP emulators have encountered a maddening roadblock: "Error 39: Windows cannot load the device driver for this hardware. The driver may be corrupted or missing." Disable Signature Enforcement → Uninstall old bus →

This error appears specifically within Windows Device Manager under the System Devices node, attached to a component named "Virtual USB Bus" or "HASP Key – Virtual USB Bus." The symptom is immediate: Mastercam (versions X7 through 2022) fails to detect the license, refuses to start, or throws a "No SIM found" error.

If you have spent hours reinstalling drivers, disabling antivirus, or even reinstalling Windows—only to see the dreaded yellow exclamation mark on the Virtual USB Bus—this guide is for you. Below, we dissect the root cause and provide seven proven methods to permanently fix Error 39 in Mastercam X7–2022.

Step 1: Preliminary Checks (Before Touching Drivers)

Do not jump straight into registry editing. First, perform these quick checks:

  • Disable Secure Boot (UEFI systems): Enter BIOS → Secure Boot → Disabled. Many virtual bus drivers are not Secure Boot compliant.
  • Turn off Core Isolation / Memory Integrity (Windows 10/11): Go to Windows Security → Device Security → Core Isolation → Turn off Memory Integrity. Reboot.
  • Temporarily disable Antivirus: Bitdefender, Avast, and even Windows Defender have been known to quarantine vusbbus.sys. Restore from quarantine if needed.
  • Verify user account control: Run Mastercam and driver installers as Administrator.

If these steps do not resolve Error 39, move to the advanced fixes below.

Preventing Error 39 from Returning

Once fixed, take these steps to avoid recurrence:

  • Block automatic driver updates via Group Policy (Computer Configuration → Administrative Templates → System → Device Installation → “Prevent installation of devices not described by other policy settings”).
  • Pause Windows Updates for up to 30 days, especially if the error appeared after a quality update.
  • Create a system restore point immediately after the Virtual USB Bus shows “This device is working properly.”
  • Use Mastercam’s License Manager Wrapper (for network licenses) instead of a virtual bus emulator.